Removed the xunit reference from Raven.Tests.Helpers project and modified the code to use System.Diagnostic methods for assertions
changed the code in Raven.Tests.Helpers/RavenTestBase.cs to throw exception in stand of the XUnit assertions
Merge pull request #1507 from talweiss1982/master

Removed the xunit reference from Raven.Tests.Helpers project and modifie...